This is achieved through . Modders take the original PES 2014 (or sometimes PES 2013) ISO and overwrite the following:
One of the most sought-after titles in this scene is . psp iso pes 2023
This article will explain everything: why an official PES 2023 doesn't exist, how fan-made Season Patches work, where to safely find them, and a step-by-step guide to installing the ISO on your device. This is achieved through